CN103836762B - Variable frequency air conditioner and method and device for controlling variable frequency air conditioning system - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a variable frequency air conditioner and a method and device for controlling a variable frequency air conditioning system. According to the variable frequency air conditioner and the method and device for controlling the variable frequency air conditioning system, required operating frequency of a compressor is calculated according to the actual operating mode of the air conditioning system, the temperature set by a user and the indoor environment temperature, the highest permissible operating frequency of the compressor is obtained according to the supply voltage of the air conditioning system and the outdoor environment temperature, the required operating frequency is compared with the highest permissible operating frequency, the compressor is controlled to operate at the required operating frequency when the highest permissible operating frequency is higher than or equal to the required operating frequency, the compressor is controlled to operate at the highest permissible operating frequency when the highest permissible operating frequency is lower than the required operating frequency, and thus the maximum operating frequency of the air conditioning system is controlled. In this way, it can be guaranteed that the air conditioning system can operate reliably under different voltages, the risk is reduced, and potential safety hazards are reduced.

Description

Convertible frequency air-conditioner and system control method thereof and device

Technical field

The invention belongs to air-conditioning technical field, particularly relate to a kind of convertible frequency air-conditioner and system control method thereof and device.

Background technology

Along with the raising of people's living standard, air-conditioning as the necessary of daily life, has come into huge numbers of families, i.e. Being in remote western countryside, also increasing user has used air-conditioning products.

But, owing to the user of western mountainous areas is sparsely populated, line voltage also less stable, the most permissible when voltage is minimum As little as 150V, and when frequency-conversion air-conditioning system is operated between low-voltage area, if operating in high frequency state, may be due to voltage mistake Low and cause compressor step-out fly frequency；The most easily produce instantaneous large-current when step-out, and then cause compressor drum to demagnetize, lead Cause the permanent damage of frequency-conversion air-conditioning system, and there is potential safety hazard.On the other hand, owing to ambient temperature is different, air-conditioning system The pressure of the internal coolant of system is also not quite similar, and may result in copper pipe explosion, security incident occurs when system pressure is excessive.

Summary of the invention

Based on the problems referred to above, it is an object of the invention to provide the system control method of a kind of convertible frequency air-conditioner, to solve to become Frequently air-conditioning runs easy step-out under different voltages and flies frequency, produces the technical problem damaging and existing potential safety hazard.

To achieve these goals, the technical solution adopted in the present invention is:

A kind of frequency-conversion air-conditioning system control method, comprises the following steps:

Detection indoor environment temperature Ta；

Temperature Ts and the described indoor environment temperature Ta that set according to air conditioning system operational mode, user calculate compressor Operation demand frequency Fneed, and judge whether described operation demand frequency Fneed is 0；

When Fneed is not 0, the supply voltage U and outdoor environment temperature To of detection air conditioning system；

The corresponding of highest frequency run is allowed to close according to default supply voltage U, outdoor environment temperature To with compressor System, determines that compressor allows the highest frequency Fmax run；

The most described highest frequency Fmax allowing to run and the size of described operation demand frequency Fneed；

When the described highest frequency Fmax allowing to run is less than described operation demand frequency Fneed, control described compression Machine allows the highest frequency Fmax run to run according to described.

Further, described method also includes: when the described highest frequency Fmax allowing to run is more than or equal to described fortune During row demand frequency Fneed, control described compressor and run according to described operation demand frequency Fneed.

Further, in described temperature Ts set according to air conditioning system operational mode, user and described indoor environment temperature Degree Ta calculates operation demand frequency Fneed of compressor, and judges that whether described operation demand frequency Fneed is also to include after 0: When Fneed is 0, finishing control process.

Another object of the present invention is to provide the system control device of a kind of convertible frequency air-conditioner；Accordingly, it also can solve Convertible frequency air-conditioner runs easy step-out under different voltages and flies frequency, produces the technical problem damaging and existing potential safety hazard.

The system control device of this convertible frequency air-conditioner includes:

Temperature detecting module, is used for detecting indoor environment temperature Ta and/or outdoor environment temperature To；

Operation demand frequency calculate processing module, for according to air conditioning system operational mode, user set temperature Ts and Described indoor environment temperature Ta calculates operation demand frequency Fneed of compressor, and judges that described operation demand frequency Fneed is No is 0；

Voltage detection module, for detecting the supply voltage U of air conditioning system；

Allow the highest frequency acquisition module run, for according to supply voltage U, outdoor environment temperature To and the pressure preset Contracting machine allows the corresponding relation of the highest frequency run, and determines that compressor allows the highest frequency Fmax run；

Comparison module, for the most described highest frequency Fmax allowing to run and described operation demand frequency Fneed Size；And

Compressor operating rate-adaptive pacemaker module, for needing less than described operation as the described highest frequency Fmax allowing to run When seeking frequency Fneed, control described compressor and allow the highest frequency Fmax run to run according to described；When described permission is run Highest frequency Fmax more than or equal to described operation demand frequency Fneed time, control described compressor according to described operation need Frequency Fneed is asked to run.

Another object of the present invention also resides in a kind of convertible frequency air-conditioner of offer, and described convertible frequency air-conditioner includes system as above Control device.

Convertible frequency air-conditioner that the present invention provides and system control method and device, it is possible to according to the supply voltage of air conditioning system And outdoor environment temperature, control the maximum frequency of operation of output air conditioning system, thus ensure air conditioning system under different voltages all Can run reliably, reduce risk, reduce potential safety hazard.

Accompanying drawing explanation

Fig. 1 is the flowchart of the frequency-conversion air-conditioning system control method that the embodiment of the present invention provides；

Fig. 2 is the structural representation that the frequency-conversion air-conditioning system that the embodiment of the present invention provides controls device.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and It is not used in the restriction present invention.

Fig. 1 is the flowchart of the frequency-conversion air-conditioning system control method that the embodiment of the present invention provides, for convenience of description, Illustrate only part related to the present embodiment, as shown in the figure:

In step S101, start, freeze according to the entrance that arranges of user, heat or automatic operational mode.

This step is the preferred steps of the present embodiment.User, when controlling air conditioning system start, can pre-set a system Cold, heat or automatic operational mode, wherein, when user sets pattern as time automatic, and the actual motion pattern of air conditioning system can Think refrigeration, heat or any one of air-supply etc..Certainly, during the use of convertible frequency air-conditioner, electrical network also can occur suddenly Spread of voltage, the situation of step-down, at this moment avoid the need for user and carry out the setting of operational mode, and be directly entered step S102.

In step s 102, detection indoor environment temperature Ta.

In step s 103, temperature Ts set according to air conditioning system operational mode, user and described indoor environment temperature Ta calculates operation demand frequency Fneed of compressor, and judges whether described operation demand frequency Fneed is 0.

In the present embodiment, operation demand frequency Fneed of compressor is to set according to air conditioning system operational mode, user Temperature Ts and described indoor environment temperature Ta calculate and get.When the operational mode that user sets is as refrigeration, air conditioning system Actual motion pattern also for refrigeration；When the operational mode that user sets is as heating, the actual motion pattern of air conditioning system is also For heating；The operational mode set as user as time automatic, actual motion pattern can be refrigeration, heat or blow in any One, temperature Ts being specifically set by the user and indoor environment temperature Ta determine.Operation demand frequency Fneed of compressor is permissible Obtained by different computational methods, such as pid control algorithm.It is emphasized that pid control algorithm only shows especially Example, if any can calculate the mode of operation demand frequency Fneed, method all patent of the present invention protection domain it In.

After obtaining operation demand frequency Fneed of compressor, be whether 0 to judge Fneed.Ordinary circumstance Under, Fneed is not 0；The only operational mode in air conditioning system is the user's design temperature under air supply pattern or heating mode Ts is less than when under indoor environment temperature Ta or refrigeration mode, user design temperature Ts is more than indoor environment temperature Ta, and Fneed is It is 0.If Fneed is 0, then enter step S109；If Fneed is not 0.Then enter step S104.

In step S104, the supply voltage U and outdoor environment temperature To of detection air conditioning system.

In this step, the supply voltage U of the air conditioning system of acquisition can be the initial value of AC supply voltage, it is also possible to be Air conditioning system exchange turns the DC bus-bar voltage after direct current.

In step S105, allow the highest of operation according to default supply voltage U, outdoor environment temperature To with compressor The corresponding relation of frequency, determines that compressor allows the highest frequency Fmax run.

In the present embodiment, this step is steps necessary.It specifically includes: first determine that the operational mode of air conditioning system is system Cold still heat；Allow with compressor under different operational modes further according to default supply voltage U and outdoor environment temperature To Corresponding relation between the highest frequency run determines that compressor allows the highest frequency Fmax run.When implementing, for Different operational modes, can pre-establish according to the span of supply voltage U and the span of outdoor environment temperature To Above-mentioned both and compressor allow between the highest frequency Fmax run form one to one, even, for, power for each group Voltage U and outdoor environment temperature To, has a specific highest frequency Fmax to correspond.

In step s 106, the most described highest frequency Fmax allowing to run and described operation demand frequency Fneed Size, it is judged that whether Fmax is more than or equal to Fneed.

In the present embodiment, this step is steps necessary.The high frequency allowing to run that will obtain from preset relation formula Rate Fmax and operation demand frequency Fneed above calculating gained compare, it is judged that whether Fmax is more than or equal to Fneed: when When Fmax is more than or equal to Fneed, enter step S108；When Fmax is less than Fneed, enter step S107.

In step s 107, controlling described compressor allows the highest frequency Fmax run to run according to described.

In step S108, control described compressor and run according to described operation demand frequency Fneed.

In the present embodiment, above-mentioned steps S107 and S108 are selectivity step.As the highest frequency Fmax allowing operation During more than or equal to operation demand frequency Fneed, enter step S108, control described compressor according to described operation demand frequency Fneed runs；When allowing the highest frequency Fmax run less than operation demand frequency Fneed, enter step S107, control institute Stating compressor allows the highest frequency Fmax run to run according to described.It is to say, above-mentioned two step makes air conditioning system Premised on operating within the highest frequency Fmax allowing to run, and then meet the frequency of actual motion demand the most as far as possible Fneed, this way it is secured that air conditioning system can be run under different voltages reliably, reduces risk, decreases safety Hidden danger.

In step S109, finishing control process.

In order to further illustrate technical solutions according to the invention, illustrate below by 2 specific embodiments.

Embodiment one:

A kind of frequency-conversion air-conditioning system control method, comprises the following steps:

S11: user controls air conditioning system start, and is set as refrigeration, heats or the most any operational mode；

S12: detection indoor environment temperature Ta；

S13: temperature Ts and the indoor environment temperature Ta that set according to air conditioning system operational mode, user calculate compressor Operation demand frequency Fneed, and judge whether described operation demand frequency Fneed is 0.Work as F_needStep is entered when not being 0 S14；Work as F_needFinishing control process when being 0.In this example, operation demand frequency Fneed uses PID control method to calculate:

A () is when air-conditioning actual motion pattern is for heating:

F in formula₁For PID regulator, adjuster settings r (t) is temperature Ts that user sets, and actual value c (t) is room Interior ambient temperature Ta, deviation e (t) is temperature Ts and difference TS-Ta of indoor environment temperature Ta set, and is:

$F_1(\mathrm{TS}-\mathrm{Ta})=K_{P1}(\mathrm{TS}-\mathrm{Ta})+K_{I1}{\∫}_0^t(\mathrm{TS}-\mathrm{Ta})\mathrm{dt}+K_{D1}\frac{d(\mathrm{TS}-\mathrm{Ta})}{\mathrm{dt}}$

Wherein, COEFFICIENT K_P1、K_I1And K_D1It is set in advance according to different air conditioning systems；In this example, K_P1It is 0.3, K_I1It is 0.08, K_D1It is 0.

B () is when air-conditioning actual motion pattern is for refrigeration:

F in formula₂Also being PID regulator, adjuster settings r (t) is temperature Ts that user sets, and actual value c (t) is room Interior ambient temperature Ta, deviation e (t) is design temperature and difference TS-Ta of indoor environment actual temperature:

$F_2(\mathrm{TS}-\mathrm{Ta})=K_{P2}(\mathrm{TS}-\mathrm{Ta})+K_{I2}{\∫}_0^t(\mathrm{TS}-\mathrm{Ta})\mathrm{dt}+K_{D2}\frac{d(\mathrm{TS}-\mathrm{Ta})}{\mathrm{dt}}$

Same, COEFFICIENT K_P2、K_I2、K_D2It is set in advance according to different air conditioning systems；In this example, K_P2For-0.2, K_I2For-0.05, K_D2It is 0.

When () air-conditioning actual motion pattern is for air-supply c: F_need=0.

S14: the supply voltage U and outdoor environment temperature To of detection air conditioning system, supply voltage U uses air conditioning system here AC supply voltage.

S15: the highest frequency allowing according to default supply voltage U, outdoor environment temperature To and compressor to run right Should be related to, determine that compressor allows the highest frequency Fmax run；Inquiry table 1 when air conditioning system actual motion pattern is for heating, Air conditioning system actual motion pattern is for tabling look-up 2 during for refrigeration.

Table 1: operational mode is for heating

Table 2: operational mode is refrigeration

S16: calculate in highest frequency Fmax Yu S13 of the permission operation comparing reading from above 2 forms The size of operation demand frequency Fneed, it is judged that whether Fmax is more than or equal to Fneed;

S17: work as F_need≤F_MAXTime, control compressor according to F_needFrequency run；Work as F_need＞ F_MAXTime, control compression Machine is according to F_MAXFrequency run.

Embodiment two:

A kind of frequency-conversion air-conditioning system control method, comprises the following steps:

S21: user controls air conditioning system start, and is set as refrigeration, heats or the most any operational mode；

S22: detection indoor environment temperature Ta；

S23: temperature Ts and the indoor environment temperature Ta that set according to air conditioning system operational mode, user calculate compressor Operation demand frequency Fneed, and judge whether described operation demand frequency Fneed is 0.Work as F_needStep is entered when not being 0 S24；Work as F_needFinishing control process when being 0.In this example, operation demand frequency Fneed uses PID control method to calculate equally:

A () is when air-conditioning actual motion pattern is for heating:

F in formula₁For PID regulator, adjuster settings r (t) is temperature Ts that user sets, and actual value c (t) is indoor Ambient temperature Ta, deviation e (t) is temperature Ts and difference TS-Ta of indoor environment temperature Ta set:

$F_1(\mathrm{TS}-\mathrm{Ta})=K_{P1}(\mathrm{TS}-\mathrm{Ta})+K_{I1}{\∫}_0^t(\mathrm{TS}-\mathrm{Ta})\mathrm{dt}+K_{D1}\frac{d(\mathrm{TS}-\mathrm{Ta})}{\mathrm{dt}}$

In this example, K_P1It is 0.3, K_I1It is 0.08, K_D1It is 0.

B () is when air-conditioning actual motion pattern is for refrigeration:

F in formula₂Also being PID regulator, adjuster settings r (t) is temperature Ts that user sets, and actual value c (t) is room Interior ambient temperature Ta, deviation e (t) is design temperature and difference TS-Ta of indoor environment actual temperature:

$F_2(\mathrm{TS}-\mathrm{Ta})=K_{P2}(\mathrm{TS}-\mathrm{Ta})+K_{I2}{\∫}_0^t(\mathrm{TS}-\mathrm{Ta})\mathrm{dt}+K_{D2}\frac{d(\mathrm{TS}-\mathrm{Ta})}{\mathrm{dt}}$

In this example, K_P2For-0.2, K_I2For-0.05, K_D2It is 0.

When () air-conditioning actual motion pattern is for air-supply c: F_need=0

S24: the supply voltage U and outdoor environment temperature To of detection air conditioning system, supply voltage U here use air-conditioning system The DC bus-bar voltage of system；

S25: the highest frequency allowing according to default supply voltage U, outdoor environment temperature To and compressor to run right Should be related to, determine that compressor allows the highest frequency Fmax run；Inquiry table 3 when air conditioning system actual motion pattern is for heating, Air conditioning system actual motion pattern is for tabling look-up 4 during for refrigeration.

Table 3: operational mode is for heating

Table 4: operational mode is refrigeration

S26: calculate in highest frequency Fmax Yu S23 of the permission operation comparing reading from above 2 forms The size of operation demand frequency Fneed, it is judged that whether Fmax is more than or equal to Fneed;

S27: work as F_need≤F_MAXTime, control compressor according to F_needFrequency run；Work as F_need＞ F_MAXTime, control compressor According to F_MAXFrequency run.

The frequency-conversion air-conditioning system control method that the present invention provides, it is possible to according to supply voltage and the outdoor environment of air conditioning system Temperature, controls the maximum frequency of operation of output air conditioning system, thus ensures that air conditioning system can be reliable under different voltages Run, reduce risk, reduce potential safety hazard.

Fig. 2 is the structural representation that the frequency-conversion air-conditioning system that the embodiment of the present invention provides controls device, for convenience of description, Illustrate only part related to the present embodiment, as shown in the figure:

Frequency-conversion air-conditioning system controls device, including: temperature detecting module 31, operation demand frequency calculating processing module 32, Voltage detection module 33, the highest frequency acquisition module 34 of permission operation, comparison module 35, compressor operating rate-adaptive pacemaker module 36；As preferably, also include that operational mode receiver module 37 and process terminate module 38；

Wherein, temperature detecting module 31 is used for detecting indoor environment temperature Ta and/or outdoor environment temperature To；

Operation demand frequency calculate processing module 32 for temperature Ts set according to air conditioning system operational mode, user and Described indoor environment temperature Ta calculates operation demand frequency Fneed of compressor, and judges that described operation demand frequency Fneed is No is 0；

Voltage detection module 33 is for detecting the supply voltage U of air conditioning system；

Allow the highest frequency acquisition module 34 that runs for according to supply voltage U, the outdoor environment temperature To preset with Compressor allows the corresponding relation of the highest frequency run, and determines that compressor allows the highest frequency Fmax run；

Comparison module 35 is for the most described highest frequency Fmax allowing to run and described operation demand frequency Fneed Size；

Compressor operating rate-adaptive pacemaker module 36 is for when the described highest frequency Fmax allowing to run is less than described operation During demand frequency Fneed, control described compressor and allow the highest frequency Fmax run to run according to described；Fortune is allowed when described When the highest frequency Fmax of row is more than or equal to described operation demand frequency Fneed, control described compressor according to described operation Demand frequency Fneed is run.

Operational mode receiver module 37 is for entering refrigeration according to arranging of user, heat or run automatically after powering Pattern；

Process terminates module 38 then for finishing control process when Fneed is 0 or when shutting down.

The embodiment of the present invention also provides for a kind of convertible frequency air-conditioner including above-mentioned control device.Control the structure such as figure of device Shown in 2, do not repeat them here.

Convertible frequency air-conditioner that the present invention provides and system control method and device, according to air conditioning system actual motion pattern, The temperature of user's setting and indoor environment temperature calculate operation demand frequency Fneed of compressor, and according to air conditioning system Supply voltage and outdoor environment temperature obtain compressor allow run highest frequency Fmax, by operation demand frequency Fneed Compare with allowing the highest frequency Fmax run, when allowing the highest frequency Fmax run more than or equal to operation demand frequency During Fneed, control compressor and run according to operation demand frequency Fneed；When allowing the highest frequency Fmax run less than running During demand frequency Fneed, control compressor and run according to the highest frequency Fmax allowing operation, control the maximum fortune of air conditioning system Line frequency.This way it is secured that air conditioning system can be run under different voltages reliably, reduce risk, decrease peace Full hidden danger.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, although with reference to aforementioned reality Executing example and the present invention has carried out explanation in greater detail, for a person skilled in the art, it still can be to aforementioned each reality Execute the technical scheme described in example modify or wherein portion of techniques feature is carried out equivalent.All the present invention's Any amendment, equivalent and the improvement etc. made within spirit and principle, should be included within the scope of the present invention.

Claims (9)

1. a frequency-conversion air-conditioning system control method, it is characterised in that said method comprising the steps of:

Detection indoor environment temperature Ta；

Temperature Ts set according to air conditioning system operational mode, user and described indoor environment temperature Ta calculate the operation of compressor Demand frequency Fneed, and judge whether described operation demand frequency Fneed is 0；

When Fneed is not 0, the supply voltage U and outdoor environment temperature To of detection air conditioning system；

The corresponding relation of the highest frequency of operation is allowed with compressor, really according to default supply voltage U, outdoor environment temperature To Determine the highest frequency Fmax that compressor allows to run；

The most described highest frequency Fmax allowing to run and the size of described operation demand frequency Fneed；

When the described highest frequency Fmax allowing to run is less than described operation demand frequency Fneed, controls described compressor and press The highest frequency Fmax run is allowed to run according to described；

Described temperature Ts and the described indoor environment temperature Ta set according to air conditioning system operational mode, user calculates compressor Operation demand frequency Fneed, and judge described operation demand frequency Fneed be whether 0 particularly as follows:

Temperature Ts set according to air conditioning system operational mode, user and described indoor environment temperature Ta, use pid control algorithm Calculate operation demand frequency Fneed of compressor, and judge whether described operation demand frequency Fneed is 0；

Described operation demand frequency Fneed uses PID control method to calculate:

A () is when air-conditioning actual motion pattern is for heating:

F in formula₁For PID regulator, adjuster settings r (t) is temperature Ts that described user sets, and actual value c (t) is institute Stating indoor environment temperature Ta, deviation e (t) is temperature Ts and difference TS-Ta of described indoor environment temperature Ta of described user setting, It is:

$F_1(TS-Ta)=K_{P1}(TS-Ta)+K_{I1}{\∫}_0^t(TS-Ta)dt+K_{D1}\frac{d(TS-Ta)}{dt}$

Wherein, COEFFICIENT K_P1、K_I1And K_D1It is set in advance according to different air conditioning systems；

B () is when air-conditioning actual motion pattern is for refrigeration:

F in formula₂Also being PID regulator, adjuster settings r (t) is temperature Ts that described user sets, and actual value c (t) is institute Stating indoor environment temperature Ta, deviation e (t) is described user's design temperature and difference TS-Ta of described indoor environment actual temperature:

$F_2(TS-Ta)=K_{P2}(TS-Ta)+K_{I2}{\∫}_0^t(TS-Ta)dt+K_{D2}\frac{d(TS-Ta)}{dt}$

COEFFICIENT K_P2、K_I2、K_D2It is set in advance according to different air conditioning systems；

When () air-conditioning actual motion pattern is for air-supply c: F_need=0.

2. frequency-conversion air-conditioning system control method as claimed in claim 1, it is characterised in that run described permission of described comparison Highest frequency Fmax also include after the size of described operation demand frequency Fneed:

When the described highest frequency Fmax allowing to run is more than or equal to described operation demand frequency Fneed, control described pressure Contracting machine runs according to described operation demand frequency Fneed.

3. frequency-conversion air-conditioning system control method as claimed in claim 1, it is characterised in that run according to air conditioning system described Pattern, temperature Ts of user's setting and described indoor environment temperature Ta calculate operation demand frequency Fneed of compressor, and judge Whether described operation demand frequency Fneed is also to include after 0:

When Fneed is 0, finishing control process.

4. frequency-conversion air-conditioning system control method as claimed in claim 1, it is characterised in that at described detection indoor environment temperature Also include before Ta:

Start, freezes according to the entrance that arranges of user, heats or automatic operational mode.

5. frequency-conversion air-conditioning system control method as claimed in claim 1, it is characterised in that described when Fneed is not 0, inspection Survey air conditioning system supply voltage U and outdoor environment temperature To particularly as follows:

When Fneed is not 0, the voltage U and outdoor environment temperature To of detection air conditioning system alternating current power supply；Or

When Fneed is not 0, detection air conditioning system exchange turns the DC bus-bar voltage U after direct current and outdoor environment temperature To.

6. frequency-conversion air-conditioning system control method as claimed in claim 1, it is characterised in that the supply voltage that described basis is preset U, outdoor environment temperature To allow the corresponding relation of the highest frequency run with compressor, determine that compressor allows the highest of operation Frequency Fmax particularly as follows:

Determine that the operational mode of air conditioning system is refrigeration or heats；

Under different operational modes, the highest of operation is allowed with compressor according to default supply voltage U and outdoor environment temperature To Corresponding relation between frequency determines that compressor allows the highest frequency Fmax run.

7. a frequency-conversion air-conditioning system controls device, it is characterised in that described device includes:

Temperature detecting module, is used for detecting indoor environment temperature Ta and/or outdoor environment temperature To；

Operation demand frequency calculates processing module, for temperature Ts and described set according to air conditioning system operational mode, user Indoor environment temperature Ta calculates operation demand frequency Fneed of compressor, and judges that whether described operation demand frequency Fneed is 0；

Voltage detection module, for detecting the supply voltage U of air conditioning system；

Allow the highest frequency acquisition module run, for according to supply voltage U, outdoor environment temperature To and the compressor preset Allow the corresponding relation of the highest frequency run, determine that compressor allows the highest frequency Fmax run；

Comparison module, for the size of the most described highest frequency Fmax allowing to run with described operation demand frequency Fneed； And

Compressor operating rate-adaptive pacemaker module, for when the described highest frequency Fmax allowing to run is less than described operation demand frequency During rate Fneed, control described compressor and allow the highest frequency Fmax run to run according to described；When described permission is run When altofrequency Fmax is more than or equal to described operation demand frequency Fneed, control described compressor according to described operation demand frequency Rate Fneed is run；

Described operation demand frequency calculates temperature Ts and the described room that processing module sets according to air conditioning system operational mode, user Interior ambient temperature Ta calculates operation demand frequency Fneed of compressor, and judges whether described operation demand frequency Fneed is 0 Process particularly as follows:

Temperature Ts set according to air conditioning system operational mode, user and described indoor environment temperature Ta, use pid control algorithm Calculate operation demand frequency Fneed of compressor, and judge whether described operation demand frequency Fneed is 0；

Described operation demand frequency Fneed uses PID control method to calculate:

A () is when air-conditioning actual motion pattern is for heating:

F in formula₁For PID regulator, adjuster settings r (t) is temperature Ts that described user sets, and actual value c (t) is institute Stating indoor environment temperature Ta, deviation e (t) is temperature Ts and difference TS-Ta of described indoor environment temperature Ta of described user setting, It is:

$F_1(TS-Ta)=K_{P1}(TS-Ta)+K_{I1}{\∫}_0^t(TS-Ta)dt+K_{D1}\frac{d(TS-Ta)}{dt}$

Wherein, COEFFICIENT K_P1、K_I1And K_D1It is set in advance according to different air conditioning systems；

B () is when air-conditioning actual motion pattern is for refrigeration:

F in formula₂Also being PID regulator, adjuster settings r (t) is temperature Ts that described user sets, and actual value c (t) is institute Stating indoor environment temperature Ta, deviation e (t) is described user's design temperature and difference TS-Ta of described indoor environment actual temperature:

$F_2(TS-Ta)=K_{P2}(TS-Ta)+K_{I2}{\∫}_0^t(TS-Ta)dt+K_{D2}\frac{d(TS-Ta)}{dt}$

COEFFICIENT K_P2、K_I2、K_D2It is set in advance according to different air conditioning systems；

When () air-conditioning actual motion pattern is for air-supply c: F_need=0.

8. frequency-conversion air-conditioning system as claimed in claim 7 controls device, it is characterised in that described device also includes:

Operational mode receiver module, for entering refrigeration according to arranging of user after powering, heating or automatic operational mode； And

Process terminates module, for finishing control process when Fneed is 0 or when shutting down.

9. a convertible frequency air-conditioner, it is characterised in that described convertible frequency air-conditioner includes that system as claimed in claim 7 or 8 controls dress Put.